Valve-grinder



C,1.BODENSTUN.

VALVE GmNDER. APPLICATION FILED APR-4, 1919.

1 Y I Maru 8,

UNITED STATES PATENT OFFICE.

VALVE-GRINDER.

Specification of Letters Patent.

Patented Mar. 8, 1921.

Application inea April 4, 1919. serial No. 287,526.

To all whom it may concern:

Be it known that I, CHARLES BODEN- sTErN, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Valve- (lrrinders, of which the following is a specification.

My invention relates to improvements in valve grinders of the type used to grind the valves used in engines, motors, pumps, and other class of mechanisms where necessary to make the valve seat absolutely snug tting.

One object of my invention is the production of a `valve grinder which will have all necessary adjustments to permit the device to operate from the most convenient position with reference to the valve and engine.

Another object of my invention is the provision of a device having accommodating adjustments and imparting to the valve an oscillating motion to effect, in connection with a suitable abrasive, the grinding of the valve and its seat and also having a lifting action to bodily raise the valve and allow the abrasive material to be drawn to the center of the ground surface of the valve seat by the suction caused by lifting the valve.

Another object of my invention is the provision of a valve grinder which will permit only the required pressure to be applied to effect the proper grinding action, and which will upon excess pressure being applied fail to operate.

Another object of my invention is the provision of a valve grinder which will be small and compact to be easily stored and carried; which will be of simple, durable and inexpensive construction and which generally in all important respects will prove desirable, efiicient and practical.

To attain the objects stated and such others as reside in a device of this character the invention consists of a valve grinder embodying novel features of construction, combination, and arrangement of parts, substantially as shown, described and claimed herein.

In the drawings:

Figure 1 is a view in elevation partly in section showing the manner of using my device.

Fig. 2 is a side elevation of the double yoke and fork portion of the device viewed at right angles to that shown in Fig. 1.

Fig. 3 is a detail View of the valve and valve seat.

Fig. 4L is a detail perspective view of the novel form of fork and double yoke construction and including the guide shank of my invention.

Fig. 5 is a detached perspective view of the sleeve.

The valve grinder is of very simple construction and consists of a handle A, a fork B, formed on threaded shank C, having reduced stem D, fitting in socket E; tube F; @upon said stem, coiled spring G; and nuts H, for adjusting said spring, the stem D carrying a pin lD, adapted to engage recesses E', of the tube F, to lock the shank and prevent turning of said shank.

From this construction it will be seen that the turning of the handle imparts a similar movement of the shank and the fork, and in the fork is pivotally mounted at J the lower ends of the yoke B, while rigidly secured to theMyoke at I, is the yoke-shaped valve grip whose pair of spring arms tend outward at their extremities N, to spring into the standard openings O in valve P adapted to fit the valve seat Q of the engine. p 4

In operation a suitable abrasive material is placed between the valve and its seat and the spring yoke is fitted to the valve, in which position the -handle is manipulated with an oscillating movement either in a vertical or inclined position, to turn the valve and produce asmooth and even face between the valve and its seat, this oscillating movement causes the abrasive to accumulate at the edges of the valve and when accumulation occurs it is only necessary to lift the handle and with it the valve from its seat and this action causes the accumulation to be sucked to the center of the valve seat thus renewing the proper amount of abrasive material. At the same time the valve is raised to renew the abrasive, by the action of the suction, the valve is given a part turn to insure an even distribution of the abrasive around the circumference of the valve seat and also an even distribution of the wear caused by the abrasive. The valve should be lifted frequently during the operation of grinding to insure a complete renewal of accumulated abrasive and the grinding of smooth surfaces, and only a moderate pressure is required to obtain the best results, the releasing attachment and adjustable spring,insuring-the proper pres# sure to obtain the best results.

The abrasive mixed with materialground from the valve and the engine, must be removed occasionally and new abrasive applied.

Good practice in grinding valves requires that the valve be oscillated approximately five'or sixA times, then raised and givenV al part turm this operation repeated rom ten to twenty times when the abrasive and ground materiall should be removed and new abrasive applied. e

If thel valve isl oscllated too many times the pressure applied on the last few particles of the abrasive grinds a groove around the circumference of the valve seat which is destructive to the proper action of the valve.

I claim:

l. A valve grinder comprising a handle, a movable shank mounted inl said handle, a fork at the end of lthe shank, a double yoke valve engaging member mounted in said fork, means for preventing movement of the shank with reference to the handle, and means whereby the valve engaging member may 'have a swinging movement with referenceto the valve.

2. A valve grinder comprising a handle,

a movable shank mounted in said handle, a fork at the end of the shank, a double yoke valve engaging v'member mounted in said fork, means for preventing movement of the shank with reference to thev handle, and means wherebyrthe valve engaging member may have a swinging movement with reference to the valve, there being a flexible connection between the shank andlv the valve engaging member. Y Y

3. A valve grinder consisting 0f a handle, a shank carrying the said handle, al valve engaging member swingingly mounted in said shank and having springA arms to en/ gage notches in the head of the valve to permit manipulation of the valve from different positions with reference to said valve.

In testimony whereof I aiiX my signature.

CHARLES@ L BODENSTEIN- 

